带to的初中英语情态动词

带to的情态动词
 
带to 的初中英语情态动词有四个：ought to, have to, used to, be to, 如加上have got to ,(=must), be able to，为六个。它们的疑难，否定形式应予以留心：

　 Do they have to pay their bill before the end of the month 
She didn't use to play tennis before she was fourteen.
You ought not to have told her all about it.
Ought he to see a heart specialist at once.  内容来自

　 ought to 本身作文作为初中英语情态动词应用。其余的词作为实义动词利用，变疑难，否认时，须有do 等助动词辅助。

典型初中有情态动词例题
Tom ought not to ___ me your secret, but he meant no harm.　
A.have told　B.tell　C.be telling　D. having told
答案A。由于后句为从前时，告诉秘密的动作又发生在其前因，此天时用从前实现时，但它在情态动词 ought to 后，所以用have。

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